This is a DELL system component, specifically a part for a server or workstation with the part number 379-BDSV. It is explicitly stated that this unit does NOT include a backplane, meaning it is a standalone component and not part of a larger integrated system board or chassis.
This could be a riser card, a specific type of storage controller without integrated backplane functionality, or another modular component where the backplane is a separate purchase or integrated elsewhere in the system.
379-BDSV - Dell NO BACKPLANE